High-speed railway nose-shaped metal sound barrier unit board

Abstract

The invention discloses a nose-shaped metal sound barrier unit plate for a high-speed railway. The unit plate comprises an aluminium alloy face plate (1), an aluminium alloy back plate (9), a fiber cement plate (13) between the aluminium alloy face plate (1) and the aluminium alloy back plate (9), sound absorbing materials (14) and sound absorbing material fixing devices (16), wherein a nose-shaped bulge (2) protruding outwards is arranged in the middle-upper part of the aluminium alloy face plate (1); the slant part of the nose-shaped bulge (2) is arc-shaped; a transverse bottom (3) is provided with sound absorbing materials (15); and sound holes (4) are arranged on the bottom (3) of the nose-shaped bulge (2) and on the parts except the nose-shaped bulge (2), on the aluminium alloy face plate (1). The unit plate has a strong barrier effect on sounds and has a good noise reduction effect.

Description

technical field [0001] The invention relates to a high-speed railway nose-shaped metal sound barrier unit plate. Background technique [0002] With the rapid development of high-speed railways in our country, the noise pollution generated when high-speed trains pass through residential areas has seriously affected the normal work and rest of residents, and the construction of sound barriers is an effective control measure. [0003] There are two problems in the construction of high-speed railway sound barriers: first, the mechanism of high-speed railway noise generation is complex, and the main sound sources of external radiated noise are wheel-rail contact parts, bogies, pantographs and their bases, and aerodynamic forces at vehicle connections. Noise, sound pressure is more significant in low frequency, middle frequency and high frequency. Second, the sound barriers built along the high-speed railway are relatively close to the rails. When the train passes by at high spee...

AI Technical Summary

Problems solved by technology

The existing problems are: 1. Because the aluminum alloy panel is straight, the thickness of the inner cavity of the unit plate is limited and fixed, and the sound absorption effect on the medium and low frequencies is poor; and only the sound absorption effect of the sound-absorbing material and the sound insulation effect of the fiber cement board, There is no form of scattering noise reduction, which also leads to unsatisfactory noise reduction effect, and its noise reduction effect on railway noise is about 5dB(A)

2. The sound-absorbing holes on the flat aluminum alloy panels are also prone to rainwater, which will easily cause the sound-absorbing material to become damp and fail in advance, which not only reduces the noise reduction effect, but also increases the maintenance cost in the later period

3. The sound-absorbing holes on the straight aluminum alloy panel are also easy to attach dust, which will cause the noise reduction effect to deteriorate after a period of use

Images